21–23 Sept 2023
Central European University, CEU Nador 15 Campus (Budapest, Hungary)
Europe/Budapest timezone

Changes in atomic structures on a Gd65TM35 glass by cryogenic rejuvenation

21 Sept 2023, 12:00
30m
room 103 (Central European University, CEU Nador 15 Campus (Budapest, Hungary))

room 103

Central European University, CEU Nador 15 Campus (Budapest, Hungary)

H-1051 Budapest, Nádor utca 9. (Hungary)
Th2

Speaker

Prof. Shinya Hosokawa (Kumamoto University)

Description

Rejuvenation in glasses is defined as an excitation to a higher energy state by an external stress. Ketov et al. reported a rejuvenation effect in metallic glasses (MGs) by a temperature cycling between room and liquid N2 temperatures [1]. Hufnagel reviewed such a cryogenic rejuvenation, and suggested that non-affine deformation must be caused on an atomistic length scale [2]. We carried out a high-energy x-ray diffraction (HEXRD) and an elementally-selective anomalous x-ray scattering (AXS) on a Gd65Co35 MG. We analyzed these data by a reverse Monte Carlo modeling, and found distinct structural changes around both the Gd and Co atoms [3]. Subsequently, we performed the same experiments and analyses on a Gd65Ni35 MG, and closely similar results were realized in partial structures. In this presentation, we will report the structural changes of the Gd65TM35 MG alloys by the cryogenic rejuvenation in detail.

[1] S. V. Ketov et al., Nature 524, 200 (2015)
[2] T. C. Hufnagel, Nature Mater. 14, 867 (2015)
[3] S. Hosokawa et al., to be submitted to Sci. Adv.

Primary author

Prof. Shinya Hosokawa (Kumamoto University)

Presentation materials

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